ANNEXURE C (Contd.)

CASE IV: DUAL FUEL (NATURAL GAS AND NAPHTHA) - 1ST YEAR OF OPERATION

A) DATA

1.a) First Year Installed Capacity on Natural Gas 105 MW (2x35 MW CT + 1x35 MW ST)
b) First Year Installed capacity on Naphtha 102 MW
2 Combustion Turbine rating
At ISO with Natural Gas
39 MW
3. Type of cooling Closed Cycle with cooling Tower
4. a) Fuel Natural Gas + Naphtha
b) NCV of fuel 8500 kCal/Sm3 for Natural Gas and 10,500 Kcal/kg for Naphtha
5 a) Natural Gas consumption as measured during the settlement period 12000 Sm3
b) Naphtha consumption as measured during the settlement period 6.48 tonnes
c) Ratio of Heat input with Natural Gas & Naphtha during the settlement period (12000x8500) : (6.48x103x10500)
= 60:40
6. NOx control measure
(NOx emission level 50 ppm with Natural Gas & 75 ppm with Naphtha)
Water injection
7. Settlement Period 1 hour

8 Net generation during the Settlement Period

83330 kWh
9. a) Loading 100% 80% 60% 50%

b) Guaranteed Net Heat Rate (kCal/kWh) as per EPC contract for Natural Gas with water injection under site ambient conditions

1940 2000 2120 2230
c) - do – for Naphtha 1960 2020 2140 2250
B) CALCULATIONS
1.(a) First Year Installed capacity on Natural Gas 105 MW
(b) First Year Installed capacity on Naphtha 102 MW

(c) Installed Capacity with dual fuel operation for the Settlement Period

105 x 0.6 + 102 x 0.4
= 103.8 MW
2. Normative Auxiliary Energy Consumption (AEC)
a) Natural Gas 2.85%
b) Naphtha 3.00%
c) Duel Fuel Operation 2.85 x 0.6 + 3.00 x 0.4
= 2.91%
3. Settlement Period Plant Load Factor (SPLF)
Gross Generation during the settlement period   83330   kWh
(100-2.91)
    100
= 85828 kWh
SPLF     85828      x 100
103.8 x 10
3
= 82.69%

4. Net Heat Rate for the settlement period with Natural gas:

4.1 Normative Net Heat Rate for the settlement period

a) Normative Gross Heat Rate (GHR) under ISO conditions as per para 1.1.4.2.1 corresponding to SPLF 82.69% with Natural Gas a fuel 1800 + (1850 - 1800) X (100-82.69)
                  20
= 1843.28 kCal/kWh
b) Adjustment in Gross Heat Rate for water injection for NOx control as per Note 2 under para 1.1.4.2.1 100 kCal/kWh

c) Normative GHR under site ambient conditions (Refer B-2.5.2.1)
(Assuming 1.025 as a factor based on manufacturer's curves for deviations of site ambient conditions (temperature, relative
humidity, atmospheric pressure, condenser vacuum) from ISO conditions )

(1843.28 + 100) x 1.025
= 1991.86 kCal/kWh
d) Normative Net heat rate for the settlement period 1991.86  x 100
(100-2.85)
= 2050.29 kCal/kWh
4.2 Net Heat Rate for the Settlement Period based on guaranteed value
(item 9 of data)
{1940 + (2000 - 1940) X (100-81.69)}1.035
                   20
= 2061.65 kCal/kWh
4.3 Applicable Net heat rate (SNHR) for the settlement period 2050.29 kCal/kWh
5. Net Heat Rate for the Settlement Period with Naphtha
5.1 Normative Net Heat Rate for the Settlement Period
a) Normative Gross Heat Rate (GHR) under ISO conditions as per para 1.1.4.2.1 corresponding to SPLF 82.69% with Natural Gas 1800+ (1850-1800) X (100-82.69)
               20
= 1843.28 kCal/kWh
b) Normative GHR under ISO conditions with Naphtha as fuel (as per para 1.1.4.2.1 Note 1) 1843.28 x 1.02
= 1880.15 kCal/kWh
c) Adjustment in Gross Heat Rate for water injection for NOx control as per Note 2 under
para 1.1.4.2.1)
50 kCal/kWh for NOx emission of 100 ppm
= 50 x 100 k Cal /kWh for NOx emission
     75                of 75 ppm
= 66.67 kCal/kWh

d) Normative GHR under site ambient conditions (Refer B -2.5.2.1)
(Assuming 1.025 as a factor based on manufacturer's curves for deviations of site ambient conditions (temperature, relative humidity, atmospheric pressure, condenser vacuum) from
ISO conditions)

(1880.15 + 66.67) x 1.025
=1995.49 kCal/kWh
e) Normative Net Heat Rate for the Settlement Period 1995.49 x 100
           100 -3.00
= 2057.21 kCal/kWh
5.2 Net Heat Rate for the Settlement Period based on guaranteed value (Item 9 of data) [1960+ (2020-1960) x (100-82.69)]1.035
                 20
= 2082.35 kCal/kWh
5.3 Applicable Net Heat Rate (SNHR) for the settlement period 2057.21 kCal/kWh
6. Fuel Consumption during the Settlement period :
6.1 a) Total Net Generation 83330 kWh
b) Net Generation with Natural Gas 83330x 0.6 = 49998 kWh
c) Net Generation with Naphtha 83330x0.4 = 33332 kWh
6.2 a) Heat input through Natural Gas 49998x2050.29 kCal
=102.510 x106 kCal
b) NCV of Natural Gas
(item 4 (b) of data)
8500 kCal/Sm3
c) Gas consumption during the settlement period 102.510x106   = 0.012060x106 Sm3
      8500
6.3 a) Heat input through Naphtha 33332x2057.21 kCal = 68.571 x 106 kCal
b) NCV of Naphtha (Item 4(b) of data) 10500 kCal/kg
c) Naphtha consumption during the Settlement Period 68.571 x 106  
      10500
= 0.006531 x 10
6 Kg
= 6.531 Tonnes
6.4 Total Fuel Consumption during the Settlement Period

0.012060 x 106 Sm3 of  Natural Gas + 6.531 Tonnes of Naphtha

CASE V: DUAL FUEL (NATURAL GAS AND NAPHTHA)- 4TH YEAR OF OPERATION)

A) DATA

1.a) First Year Installed 105 MW (2 x 35 MW CT +1x35 Capacity MW ST)
b) First Year Installed Capacity on Naphtha 102 MW
2. Combustion Turbine rating at ISO with Natural Gas 39 MW
3. Type of Cooling

Closed Cycle with cooling Tower

4. a) Fuel Natural Gas + Naphtha
b) NCV of fuel

8500 kCal/Sm3 for Natural Gas and 10,500 Kcal/Kg for Naphtha

5. a) Natural Gas consumption as measured during the settlement period 12000 Sm3
b) Naphtha consumption as measured during the settlement period 6.48 tonnes
c) Ratio of Heat input with Natural Gas & Naphtha during the settlement period (12000x8500) : (6.48x103x10500)
= 60:40
6. Ratio of Cummulative generation in the preceding 3 years with Natural Gas and Naphtha 55 : 45
7. Settlement Period 1 hour
8. NOx control measure Water injection (NOx emission level 50 ppm with Natural Gas & 75 ppm with Naphtha)
9. Net generation during the settlement period 83330 kWh
10. a) Loading 100% 80% 60% 50%

b) Guaranteed Net Heat Rate (kCal/kWh) as per EPC contract for Natural Gas with water injection under site ambient conditions

1940 2000 2120 2230
c) - do - for Naphtha 1960 2020 2140 2250

B) CALCULATIONS

1.(a) First Year Installed capacity 105 MW
(b) Capacity degradation factor for 4th year of operation (Weighted average of degradation factors with Naphtha & Gas) 0.9775 x 0.55 + 0.970 x 0.45 = 0.9741
( c ) 4th year Installed Capacity on Natural Gas 105 x 0.9741 = 102.2805 MW
(d) -----on---- Naphtha

102 x 0.9741 = 99.3582 MW

(e) 4th Year Installed Capacity with dual operation for the Settlement Period 102.2805 x 0.6 + 99.3582 x 0.4
= 101.11158 MW

2.0 Normative Auxiliary Energy Consumption (AEC)

a) Natural Gas 2.85 %
b) Naphtha 3.00 %
c) Dual Fuel Operation 2.85 x 0.6 + 3.00 x 0.4
= 2.91 %
3.0 Settlement Period Plant Load Factor (SPLF)
Gross Generation during the Settlement Period    83330
------------ kWh
(100-2.91)
------------
   100
= 85828 kWh
SPLF         85828
--------------------- X 100
101.11158 X 10
3
= 84.88 %

4.0 Net Heat Rate for the Settlement Period with Natural Gas :

4.1. Normative Net Heat Rate for the Settlement Period
a) Normative Gross Heat Rate (GHR) under ISO conditions as per para 1.1.4.2.1) corresponding to daily plf of 84.88% with Natural Gas as fuel              (1850-1800)
1800 + ---------------- x (100-84.88)
                20
= 1837.80 kCal/kWh
b) Adjustment in Gross Heat Rate for water injection for NOx control as per Note 2 under
para 1.1.4.2.1
100 kCal/kWh

c) Normative GHR under site ambient Conditions (Refer B-2.5.2.1)
(Assuming 1.025 as a factor based on manufacturer’s curves for   deviations of site ambient conditions (temperature, relative humidity, atmospheric pressure, condenser vacuum) from ISO conditions)

(1837.80 + 100) x 1.025
= 1986.25 kCal/kWh
d) Normative Net heat rate for the settlement period 1986.25 x     100
              ------------
               (100-2.85)

= 2044.52 kCal/kWh

4.2 Net Heat Rate for the Settlement Period based on guaranteed value (Item 10 of data)

{ (1940 +(2000-1940) x (100-84.88)} 1.035
                 20
= 2054.85 kCal/kWh
4.3 Applicable Net Heat Rate (SNHR) for the Settlement Period 2044.52 kCal/kWh
5. Net Heat Rate for the Settlement Period with Naphtha :

5.1 Normative Daily Net Heat Rate
a) Normative Gross Heat Rate (GHR) under ISO conditions as per para 1.1.4.2.1) corresponding
to SPLF of 84.88% with Natural Gas  Kcal/kWh
1800 + (1850-1800) x (100-84.88)
             20
= 1837.80
b) Normative GHR under ISO conditions with Naphtha as fuel (as per para 1.1.4.2.1 Note 1) 1837.80 x 1.02
= 1874.56 kCal/kWh
c) Adjustment in Gross Heat Rate for   water injection for NOx control as per Note 2 under
para 1.1.4.2.1)
50 kCal/kWh for NOx emission of 100 ppm
= 50 x 100   kCal/kWh for NOx emission
      75        of 75 ppm
= 66.67 kCal/kWh
d) Normative GHR under site ambient conditions (Refer B-2.5.2.1)
(Assuming 1.025 as a factor based on manufacturer’s curves for deviations of site ambient conditions (temperature, relative humidity, atmospheric pressure, condenser vacuum) from ISO conditions)
(1874.56 + 66.67)x1.025
=1989.76 kCal/kWh
e) Normative Net heat rate for the Settlement Period

1989.76 x 100
(100 - 3.00)
= 2051.30 kCal/kWh

5.2 Net Heat Rate for the Settlement Period based on guaranteed value (item 10 of data)

[1960 + (2020-1960) x (100-84.88)] 1.035
               20
= 2075.55 kCal/kWh
5.3 Applicable Net Heat Rate (SNHR) for the Settlement Period 2051.30 kCal/kWh

6. Fuel Consumption during the Settlement Period

6.1 a) Total Net Generation 83330 kWh

b) Net Generation on Natural Gas

83330 x 0.6
= 49998 kWh
c) Net Generation on Naphtha 83330 x 0.4
= 33332 kWh
6.2 a) Heat input through natural gas 49998 x 2044.52 kCal
= 102.222 x 10
6 kCal
b) NCV of Natural Gas (Item 4(b) of data) 8500 kCal/Sm3

c) Gas consumption during the

settlement period

102.222x106
   8500
= 0.012026 x 106 Sm3

6.3 a) Heat input through Naptha

33332 x 2051.30 kCal
= 68.374 x 106 kCal

b) NCV of Naphtha
(Item 4(b) of data)

10500 kCal/kg

c) Naphtha consumption during the settlement period

68.374x106
  10500
= 0.006512 x 10
6 Kg
= 6.512 tonnes
6.4 Total Fuel Consumption during the settlement period = 0.012026 x 106 Sm3 of Natural Gas + 6.512 tonnes of Naphtha

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